naming: h-<name> for agents, hm1nd for manager (11-char limit)

hive-c0re/src/lifecycle.rs

@@ -5,8 +5,13 @@ use std::path::Path;
 use anyhow::{Context, Result, bail};
 use tokio::process::Command;
 
-pub const AGENT_PREFIX: &str = "hive-agent-";
-pub const HIVE_PREFIX: &str = "hive-";
+/// Sub-agent container prefix. `nixos-container` caps the total container name
+/// at 11 chars (it gets encoded into network interface names), so the agent
+/// name itself can be at most `MAX_AGENT_NAME` chars.
+pub const AGENT_PREFIX: &str = "h-";
+pub const MAX_AGENT_NAME: usize = 9;
+/// Container name of the manager (a separate slot from sub-agents).
+pub const MANAGER_NAME: &str = "hm1nd";
 
 /// Mount point of the per-agent runtime directory inside the container.
 pub const CONTAINER_RUNTIME_MOUNT: &str = "/run/hive";
@@ -15,7 +20,21 @@ pub fn container_name(name: &str) -> String {
     format!("{AGENT_PREFIX}{name}")
 }
 
+fn validate(name: &str) -> Result<()> {
+    if name.is_empty() {
+        bail!("agent name must not be empty");
+    }
+    if name.len() > MAX_AGENT_NAME {
+        bail!(
+            "agent name '{name}' is too long ({} chars); max {MAX_AGENT_NAME}",
+            name.len()
+        );
+    }
+    Ok(())
+}
+
 pub async fn spawn(name: &str, agent_flake: &str, agent_dir: &Path) -> Result<()> {
+    validate(name)?;
     let container = container_name(name);
     run(&["create", &container, "--flake", agent_flake]).await?;
     write_nspawn_override(&container, agent_dir)?;
@@ -39,11 +58,13 @@ fn write_nspawn_override(container: &str, agent_dir: &Path) -> Result<()> {
 }
 
 pub async fn kill(name: &str) -> Result<()> {
+    validate(name)?;
     let container = container_name(name);
     run(&["stop", &container]).await
 }
 
 pub async fn rebuild(name: &str, agent_flake: &str) -> Result<()> {
+    validate(name)?;
     let container = container_name(name);
     run(&["update", &container, "--flake", agent_flake]).await
 }
@@ -64,7 +85,7 @@ pub async fn list() -> Result<Vec<String>> {
     Ok(String::from_utf8_lossy(&out.stdout)
         .lines()
         .map(str::trim)
-        .filter(|line| line.starts_with(HIVE_PREFIX))
+        .filter(|line| line.starts_with(AGENT_PREFIX) || *line == MANAGER_NAME)
         .map(str::to_owned)
         .collect())
 }